Terminal manager cannot fire TSA personnel, including their supervisor. They are not airport employees; Transportation Security Administration is a federal agency under Department of Homeland Security.
The very first scene in the pilot, a suicide under the wheels of a landing plane, depicts a twin-engined aircraft described as "747". Boeing 747 has four engines. It is also obvious that landing gear belongs to a smaller airplane (it is difficult to discern which). A brief frontal view also shows a circular fuselage, without a characteristic B747 "hump".